Paper sack



Oct. 19, 1965 L. ANDERSON PAPER SACK Filed Feb. 6, 1964 INVENTOR. GLE NN L. ANDERSON ATTO NEYS United States Patent 3,212,697 PAPER SACK Glenn L. Anderson, 3887 Bushnell Road, University Heights, Ohio Filed Feb. 6, 1964, Ser. No. 343,922 1 Claim. (CL 22957) This application is a continuation-in-part of my copending application, Serial No. 174,945, filed February 23, 1962, entitled iPaper Sack, now abandoned, the specification and drawings of which are incorporated herein by reference.

The present invention relates to paper sacks and their manufacture.

One of the principal objects of the invention is the provision of a novel and improved moisture-resistant paper sack which is economical to manufacture, can be made on conventional sack making machines with a minimum modification, and which functions and can be handled as a conventional paper sack.

Another of the principal objects of the invention is the provision of a novel and improved blank for use in making a moisture-resistant paper sack.

A further object of the invention is the provision of a novel and improved method of making a moistureresistant paper sack.

The invention resides in certain constructions and combinations and arrangements of parts and further objects and advantages of the invention will be apparent to those skilled in the art to which it relates from the following description of the preferred embodiment described with reference to the accompanying drawings forming a part of this specification, in which similar reference characters designate corresponding parts, and in which:

FIG. 1 is a perspective view, with portions broken away, of a paper sack embodying the present invention;

FIG. 2 is a perspective view, with portions broken away, of the lower portion of the paper sack shown in FIG. 1, but partially disassembled; and

FIG. 3 is a fragmentary plan view of a web of paper adapted to be out into a plurality of blanks for use in making sacks similar to the sack shown in FIGS. 1 and 2.

While the invention is applicable for paper sacks or bags intended for various uses it is particularly applicable to and is herein shown as applied to one form of socalled carry out paper sacks or bags employed in supermarkets, grocery storcs and like establishments selling frozen food and the like, articles which tend to wet and thus destroy the strength of the bag. This problem has existed for many years and various attempts have heretofore been made to solve it, all of which have proved unsuccessful or are unsatisfactory for one reason or another, including prohibitively high costs. One widely used unsatisfactory way of attempting to overcome the problem is the use of a plurality of sacks, one within the other.

Although only one form of paper sack embodying the invention is shown in the drawings and herein described in detail, it is to be understood that there is no intention to limit the invention to the specific form shown or to the described method, etc., but it is the intention to cover hereby all modifications and alternative constructions, etc. falling within the spirit and scope of the invention as expressed in the appended claim.

Referring to the drawings, FIG. 1 shows and the reference character A designates a 16 barrel paper sack similar to the paper sacks used in supermarkets as carry out sacks. The sack A shown is in all respects similar to a presently used carry out sack except for the fact that the lower portion of the interior of the sack is coated and/or impregnated with a moisture or water- 3,212,697 Patented Oct. 19, 1965 repellent material. The coating designated by the reference character 10 covers the exposed inner bottom and side surfaces of the sack and extends only part way up the interior sides of the sack, preferably not to exceed approximately of the height of the sack. In the preferred embodiment of the invention shown the coating covers only the interior exposed bottom and lower interim side surfaces leaving all other parts, that is, the upper interior sides, the exterior sides, and the unexposed sides or parts uncoated.

The blank used in making the sack A, shown in FIG. 1, is similar to that portion B of the paper web P, shown in FIG. 3, which is or lies between the double dot-dash lines 11, 12, which lines represent ultimate cut lines, that is lines along which the web is cut as it advances to and/ or through the sack machine, not shown. The single dotdash lines, shown in FIG. 3, represent ultimate fold lines, the solid lines additional ultimate cut lines, and the stippled areas indicate the areas to which the coating material is to be or has been applied. The portion of the blank B lying above the triple dot line 13 defines the overlap where the edges of the blank are glued together in the formation of the sack.

A comparison of the various figures of the drawings will show the positions of the various panel areas 20 and 33 and 40 to 51 of the blank shown in FIG. 3 in the finished sack.

The paper employed is preferably commercial kraft sack paper, and the moisture resistant or repellent coating is a vinyl polymer, preferably, a polyvinyl chloride or a vinyl co-polymer in a blend of solvents. The concentration of resins may be varied to suit the desired coating weight and the solvent blend can be selected to suit the desired drying rate. The coating material specified renders the paper water resistant or repellent and otherwise materially increases its strength and does not deteriorate the paper or destroy its flexibility.

The coating may be applied in any suitable way such as by being blown onto the paper web in the form of a moisture as the web is fed to the sack machine, but is preferably applied to the paper web by a roller applicator 55, for example, in a manner somewhat analogous to that employed in applying ink to a paper web. While the entire web may be coated, the coating is preferably placed on the web in a pattern so as to cover only the interior bottom and lower interior side wall surfaces of the sack formed. In this way a limited or minimum amount of coating material is required for any given sack and the sack formed can be manufactured and handled as a conventional paper sack on conventional sack making machinery. In the event only the exposed interior bottom and lower interior side surfaces of the sack are coated, conventional glue material may be employed in the formation of the sack.

In addition to the previously mentioned advantages of the coating material of the present invention, it is pos sible to select the drying rate of the coating solution employed so that it can be applied to a paper web as it enters a bag machine without the necessity of slowing down the normal operation of the machine.

From the foregoing description of the preferred embodiment of the invention it will be apparent that the objects, heretofore enumerated, and others have been accomplished and that there has been provided a novel and improved moisture repellent or moisture resistant paper sack which is economical to manufacture, can be made on conventional sack machines with the minimum of modification and which functions and handles as a conventional paper sack.

Although the preferred embodiment of the invention has been shown and described in considerable detail, it

is to .be understood that the invention disclosed is not limited to the particular form and/or construction of the sack shown and described and/or to the particular manner of making the sack, and it is the intention to hereby cover all adaptations,modifications and uses of the invention which come within the practice of those skilled in the art to which the invention relates and the scope of the appended claim.

Having thus described my, invention, what I claim is:

A paper blank for making a paper sack having collapsible bellows side walls and a square bottom, said blank being made of flexible kraft paper and having a plurality of spaced fold' and crease lines, said blank being coated in a pattern on one face thereof with polyvinyl chloride, said pattern defining a coated, area extending from one edge of the blank and terminating in spaced relation to the other edge with an uncoated area of substantially the same size as the coated area and extending from edge to edge of said blank and being contiguous to said coated area, said pattern defining a pair of coated areas of uniform size arranged in spaced relation to one another and to the edges of said blank with said pair of coated areas abutting said first-mentioned coated area,

said pattern defining an intermediate coated area interposed between and spaced from said pair of coated areas and abutting said first-mentioned coated area, the coated areas forming the interior exposed bottom and lower side surfaces of the walls of the sack upon the folding of said blank upon said fold and crease lines and the uncoated portions of the blank form all other surfaces of said sack.

References Cited by the Examiner UNITED STATES PATENTS 925,913 6/ 09 Jenkins 229--5 1,029,784 6/ 12 Appel 9335 1,365,250 1/21 Labombarde.

1,737,055 11/29 Molins 2293.1 X 2,048,122 7/36 Howard 22953 2,774,531 12/56 Rosenthal 22953' 2,837,267 6/5 8 Potdevin 229-5 3 3,026,779 3/62 Majer 2293.1 X 3,107,837 10/63 Graser 229 -31 3,150,573 9/64 Piazze 9335 GEORGE O. RALSTON, Primary Examiner. 

